Multiple-TED attendee and human factors expert, Ash Donaldson, wants us to better understand why we believe what we do. In this talk, Ash explains how our minds build belief and then breaks it down, showing us how and why humans are fooled into believing that things like Power Bands, anti-aging treatments and supplements actually work. Along the way, he tells us how as a trainee pilot he managed to nearly get himself killed by allowing his beliefs to rule logic and provable fact.